Do the people you play in real life keep their finger(s) on the stone they played last?

And no, I mean completely disabling it. Display the stone, but not the circle. That way people (yes, barring deaf people ~) could close their eyes, wait for the sound and then assess the situation somewhat objectively. I think it’s very hard for beginners and sometimes even weathered veterans to ignore that pesky circle.

I think it’s very hard for beginners and sometimes even weathered veterans to ignore that pesky circle.

I agree. But is hiding it the best option?
I know for sure that, if there was no circle, I would flip back and forth to see where did my opponent actually place his stone.
I’m not strong enough to recall board positions by heart and I think that it’s a good piece of information to know where your opponent is focusing. Even if you don’t want to answer locally. I’d say especially if you don’t want to answer locally.

Knowing which is the last move and choosing to tenuki is something that must be trained too.